CN110942805A - Insulator element prediction system based on semi-supervised deep learning - Google Patents
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Abstract
The invention discloses an insulator element prediction system based on semi-supervised deep learning, which comprises an extraction module, a coding module, a training module and an analysis module; the extraction module, the coding module, the training module and the analysis module are sequentially connected; the extraction module is used for extracting a chromosome number sequence in the DNA; the coding module is used for intercepting the sequence and coding the intercepted sequence; the training module is used for training and generating an insulator element prediction model; the analysis module is used for identifying and analyzing the insulator sequence in the DNA chromosome sequence through the trained insulator element prediction model; according to the method, the insulator element prediction model is established by combining the semi-supervised ladder network and the convolutional neural network, so that the insulator sequence in the DNA sequence can be effectively and accurately identified; meanwhile, the cost and the process of insulator element identification are effectively reduced.
Description
Technical Field
The invention relates to the field of biological insulator prediction, in particular to an insulator element prediction system based on semi-supervised deep learning.
Background
The chromatin insulator is a DNA-protein complex and has a wide range of functions in nuclear biology, in summary, the insulator is positioned between an enhancer or a promoter and a gene and is used for reducing or blocking gene expression or is used as a heterochromatin barrier, and the insulator element has very important significance in gene therapy.
Traditionally, cellular experiments have been performed to verify the insulator segments, which is not only inefficient but also expensive. The known bioinformatics methods also do not allow efficient extraction of features (sequence modules motif) inside the insulator element.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the insulator element prediction system and method based on semi-supervised deep learning are provided; the invention solves the problems of low verification efficiency and high cost of the insulator segment; the problem that the characteristics inside the insulator element cannot be effectively extracted is solved.
The technical scheme adopted by the invention is as follows:
an insulator element prediction system based on semi-supervised deep learning comprises an extraction module, a coding module, a training module and an analysis module; the extraction module, the coding module, the training module and the analysis module are sequentially connected; the extraction module is used for extracting a chromosome number sequence in the DNA; the coding module is used for intercepting the sequence and coding the intercepted sequence; the training module is used for training and generating an insulator element prediction model; and the analysis module is used for identifying and analyzing the insulator sequence in the DNA chromosome sequence through the trained insulator element prediction model.
Further, the chromosome number sequence in the removed DNA is a sequence removed from between the start position and the end position of the chromosome number.
Further, the encoding module encodes the sequence by a hot-first encoding, and converts the sequence into a matrix.
Further, the insulator element prediction model is established by carrying out convolutional neural network training on a ladder network.
Further, the ladder network is a semi-supervised ladder network, comprising.
further, the training includes: after the intercepted chromosome sequence is coded to obtain a matrix; and inputting the matrix into a neural network algorithm for training.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the insulator element prediction model is established by combining the semi-supervised ladder network and the convolutional neural network, so that the insulator sequence in the DNA sequence can be effectively and accurately identified.
2. The invention also effectively reduces the cost and the working procedure of insulator element identification.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a diagram showing a configuration of an insulator element prediction system.
FIG. 2 is a thermal-code diagram.
Wherein, 1-an extraction module; 2-an encoding module; 3-a training module; 4-an analysis module.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
An insulator element prediction system based on semi-supervised deep learning is shown in fig. 1 and comprises an extraction module 1, a coding module 2, a training module 3 and an analysis module 4; the extraction module 1, the coding module 2, the training module 3 and the analysis module 4 are connected in sequence.
The extraction module 1 is used for extracting a chromosome number sequence in DNA, wherein the chromosome number sequence in the extracted DNA is an extracted sequence between the starting position and the ending position of a chromosome number.
The coding module 2 is used for intercepting the sequence and coding the intercepted sequence; the intercepting sequence is the length of an intercepting chromosome sequence, and in the embodiment, the length of the preferred intercepting sequence is 800 bp; the sequence coding is to code the sequence through a hot-first coding, the hot-first coding can expand the space, and the discrete characteristics in the original one-dimensional space are expanded into one point in the Euclidean space, and the method can extract the characteristics of data from the angle of the space and calculate the similarity between samples; the heat-encoding of sequence data is shown in FIG. 2; a sequence of length n may be encoded by a hot-one encoding to obtain a matrix of 4 x n.
The training module 3 is used for training and generating an insulator element prediction model; the insulator element prediction model is established by carrying out convolutional neural network training on a ladder network; the ladder network is a semi-supervised ladder network, and the semi-supervised ladder network is formed by combining supervised learning and unsupervised learning.
In supervised learning, features are abstracted through a network, and the abstracted features are denoted as x ═ x (x)1,x2,......xn) Finally, the features are mapped through a full connection layer: f (x) → y, y represents the scores of all the categories, and finally training is carried out by constructing the loss of y and the real category label.
The unsupervised learning is the opposite, and the unsupervised learning uses another characterization to the original data x through the processes of compression and decompressionThe method is shown, and simultaneously, new characteristics extracted by unsupervised learning are ensured, original data information can be kept as much as possible, and the unsupervised learning is to keep the characteristics as much as possible from a loss function, so that the reconstructed data isAnd x are maximally similar.
The semi-supervised ladder network consists of a plurality of encoders and a plurality of decoders, wherein 2 encoders and 1 decoder are longitudinally connected into a group, and the semi-supervised ladder network is transversely connected with a plurality of groups; the encoder and decoder can be represented as:
the loss function of the semi-supervised ladder network consists of two parts, and the real network resultThe constructed supervised learning loss function is expressed by cross entropy loss; an unsupervised learned loss function is constructed using the original x input and the reconstructed input. And finally, adding the two loss functions to form a loss function of semi-supervised learning:
in this embodiment, the semi-supervised ladder network has two outputs with noiseThe tag and the genuine tag of (1), wherein the noise is containedIs used for the loss function and the noise-free output y is used for the classification task. The semi-supervised ladder network comprises a plurality of layers of classifiers, wherein each layer is connected to a decoding stage through skip-connection to share the information pressure of the top layer. In the process of data classification, a plurality of features or information determine data boundaries, but in supervised learning, the closer to a top-layer classifier, the fewer the remaining features are related to a classification task of a top layer, but the mapped features cannot be restored to be reconstructed through a decoding stage, at the moment, transverse connection starts to play a role, and feature signals determining the decoding stage are transmitted to a decoding layer through the transverse connection, so that a model can be normally trained, and meanwhile, when gradient is reversely propagated, the feature signals can be transmitted back along the transverse connection, and the problem of gradient disappearance is solved. In addition, noise is added into each layer of the coding stage of the semi-supervised ladder network, and the noise is added into input data (the input layer of the network) in order to prevent the over-fitting problem, so that the learned coder has stronger robustness, and the generalization capability of the model is enhanced.
The effective combination of the encoder values and the decoder values is based on a vanilla combiner, which has the formula:output of encoder l layerThe expression formula of (a) is:
combining the horizontally concatenated data with the native dataTaken together, the output of the l-th layer decoder is obtainedThe formula is as follows:
the method combines supervised learning and unsupervised learning together, solves the problem that the supervised learning has less reserved characteristics, and also solves the problem that the unsupervised learning has no difference to reserve characteristics, so that the classification effect is greatly improved. In addition, the problem of a large amount of non-tag data in reality is solved, particularly for biological sequence data, the verification cost is usually higher, meanwhile, the period of a cell experiment is longer, which means that the large amount of sequence data has no tags, which is not consistent with the large amount of data needed by deep learning, and the semi-supervised ladder network enables the deep learning to be applied in the field of biological information, but is not suitable for being applied to DNA sequence classification.
In order to effectively apply the semi-supervised ladder network to the classification of DNA sequences, a convolutional neural network is introduced, each characteristic in the DNA sequences can be effectively extracted through the convolutional neural network, after the convolutional neural network is added, the encoder stage in the semi-supervised ladder network is replaced by convolutional operation, the decoder stage is replaced by deconvolution operation, and convolution kernels are completed; in this embodiment, the convolution kernel of each layer has a length of 14, the network uses convolution kernels of three sizes, the convolution kernel of 14 × 4 is used to extract sequence modulo (motif), the convolution kernel of 3 × 1 is used to extract local features, the convolution kernel of 20 × 1 is used to extract global features, and the three convolution kernels are arranged longitudinally at one time; the method specifically comprises the following steps:
after the DNA sequence is subjected to the hot-coding, the sequence is expanded from one character in a one-dimensional space to one point in a Euclidean space, the convolutional neural network can better extract relevant features on the space, meanwhile, the convolutional neural network can represent the features in the data, and the features of the data are mainly represented by using a first layer of convolutional kernel after the training is finished.
The calculation of the convolutional neural network is formulated as follows:
wherein, the convolution kernel is a matrix, wherein M is the size of the window, and N is the size of the channel; various characteristic sequences in the DNA sequence can be extracted through a formula of a convolutional neural network, and then an insulator module sequence is found in the extracted various characteristic sequences.
The analysis module 4 is configured to identify and analyze an insulator sequence in the DNA chromosome sequence through the trained insulator element prediction model, that is, to input the insulator sequence into the trained insulator element prediction model, identify an insulator pattern in each type of sequence found by the insulator element prediction model, and label the identified insulator pattern.
According to the method, the insulator element prediction model is established by combining the semi-supervised ladder network and the convolutional neural network, so that the insulator sequence in the DNA sequence can be effectively and accurately identified; meanwhile, the cost and the process of insulator element identification are effectively reduced.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (7)
1. The insulator element prediction system based on semi-supervised deep learning is characterized by comprising an extraction module (1), a coding module (2), a training module (3) and an analysis module (4); the extraction module (1), the coding module (2), the training module (3) and the analysis module (4) are connected in sequence; the extraction module (1) is used for extracting a chromosome number sequence in DNA; the coding module (2) is used for intercepting the sequence and coding the intercepted sequence; the training module (3) is used for training and generating an insulator element prediction model; and the analysis module (4) is used for identifying and analyzing the insulator sequence in the DNA chromosome sequence through the trained insulator element prediction model.
2. The semi-supervised deep learning-based insulator element prediction system of claim 1, wherein the chromosome number sequence in the extracted DNA is a sequence extracted from between a start position and an end position of a chromosome number.
3. The semi-supervised deep learning based insulator element prediction system according to claim 1, wherein the coding module (2) codes the sequence by a heat-one coding, converting the sequence into a matrix.
4. The semi-supervised deep learning-based insulator element prediction system of claim 1, wherein the insulator element prediction model is established by convolutional neural network training of a ladder network.
5. The semi-supervised deep learning-based insulator element prediction system of claim 3, wherein the ladder network is a semi-supervised ladder network.
7. the semi-supervised deep learning-based insulator element prediction system of claim 3, wherein the training comprises: after the intercepted chromosome sequence is coded to obtain a matrix; and inputting the matrix into a neural network algorithm for training.
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